Carburetor



' A. D. AUSTIN May 6 1.924. 1,493,227

CARBURETOR Filed March 1, 1920 BY %M w v A TTORNE Y5 Patented May 6, 1924.

' nmran stares FATENT @FFifi ALBERT D. AUSTIN, OF PORTLAND, OREGON, ASSIGNOR OF FORTY-FIVE ONE-HUN- DRIEDTHS TO AUTOREST MOTORSALES COMPANY, A CORPORATION OF OREGON, I AND TWENTY ONE-HUNDREDTHS TO QUIN L. JONES, OF PORTLAND OREGON.

CARBURETOR.

Application filed March 1, 1920. Serial No. 862,446. 1'

T all whom it may concern:

Be it known that I, ALBERT D. AUSTIN, a citizen of the United States of America, and resident of Portland, in the county of Multnomah, in the State of Oregon, have invented certain new and useful Carburetors, of which the following is a specification, reference being had to the accompanying drawing.

My invention relates to carburetors, and consists in the devices set forth in the claim for controlling the admission of air and fuel.

What constitutes my invention will be hereinafter further set forth in detail and succinctly specified in the appended claim.

In the accompanying drawing,

Figure I is a side elevation, partly in section, of the present preferred form of my invention, showing means for air supply and liquid fuel supply, and for co-regulating the same. 4

Figure 11 is a medial vertical section, partly in elevation, of the subject matter of-Figure I, taken at right angles thereto.

Referring to the numerals on the drawing,

1 indicates a carburetor shell shown as comanunicating at its upper end with a manifold '2, of which the drawing shows a fragment bolted to the shell 1. Said shell is provided with an air inlet 3 and with a throttle valve 39 preferably a butterfly valve 4, transversely mounted therein to admit, exclude, or regulate the admission of air. To the axle 5 of the valve 4 is fixed a'bell-crank lever 6, one arm of which is movably secured to a rod 7 W whereby-the lever 6 may be actuated at a point remote from it by any suitable and ordinary mechanism for the purpose "not necessary to illustrate. The remaining arm of'the lever 6 is pivotally connected as' by a stud 8 with a sleeve 9 from which the stud projects.-

The sleeve 9 loosely fits a rod 10 which is threaded near one end, as indicated at 11, to accommodate nuts 12-and '14 located upon opposite sides of the sleeve-9, and adapted t5 adjustably to fix its position upon the rod 10.

A setscrew 15, working in a threaded aperturewithin a projection 16 mounted upon the shell 1, serves as an adjustable stop-piece to limit the movement of the lever 6, about the w axis of the member 5. The rod 10 is loosely connected as indicated at 18 to a crank arm" 19 secured outside of the shell 1, to a hollow shaft 20 that is mounted in a bearing 21 in the shell, and which carries on its end within alignment to both shafts 20 and 23.. The

shaft 23 carries a cam 26 that is fixed to it and s disposed in independently operative proplnquity to the cani 22.

To the end of the share 23 is fixed e crank-- arm 27 whose free end is loosely connected, as

indicated at 28, to an actuating 'ro'd 30, by

which it may be actuated substantially after the manner of the rod 7, but independently thereof.

The two cams, 22 and 26, are located in operative disposition to the head-piece, 3.1 of a valve-stem 32 mounted with snug fit ment within a bore provided for it in a screw plug 33 which, by the aid .of an annular flange 34 or other means, makes a tight joint with the top of a head 35 that is carried upon a hollow stem 36, which is rigidly united, as

by an integral close-fitting flanged annulus 37 that is secured, as by screws 38 or otherwise, to a base or annular flange 40 provided upon that end of the shell 1 that is opposite.

to the manifold 2. The transversediameterl of the stem 36 is relatively such as to afford a wide, clear space between it and the inner wall of the enclosing shell 1. I

. Within the head 35 is provided a differential pressure chamber 41. The correlative contours of the chamber 41 and of the inter nal end of the plug 33 may be varied, but I prefer, for economy of space, for instance,

to impart to the bottom of the chamber 41 a conical shape, as indicated by 42, and to the end of the plug 33 a conical contour 45 of reduced diameter, the reduction being determined by the presence of a shoulder 46 that is, by preference in practice, substantially flush with the top wall .of the chamber 41.

The presence of the bore 50 within the I stem 36 is to' make amply spacious provision upon the outside of it for a liquid fuel supply pipe 53 that is rigidly supported within the bore in coaxial relationship thereto as by a flanged nipple 54 into which it is preferably threaded, as indicated at 55, and which-is set in spaced relationship to the open end of the bore as by screw bolts 56 threaded into the end of the flanged annulus 37, through spacing sleeves 57. The free end of the pipe 53 terminates in a constricted discharge nozzle 58. 'An adjustable collar 59 is threaded to the perimeter of the flange of the nipple 54 to afford an annular regulator, whose adjustability permits control of the supply of outside air to the interior of the bore 50.

The head 35 in exterior contour is preferably of the bulbous or,-more specifically, substantially of the lozenge shape in cross section, clearly illustrated in Figure II of the drawing. One purpose of the preferred exterior contour of the head 35 is to contribute thereby to the definition of a constricted and preferably annularly deflected passage-way 60 between the interior of the shell 1 upon opposite sides of the extreme annular projection 61 of the head 35. A bulbous enlargement of the shell 1 about said projection 61, as indicated at 62, is preferably employed as complementary to the shape of the head 35 for defining the passage-way 60.

In the head 35, and preferably in close juxtaposition to the shoulder '46 of the plug 33 when in place, I provide an annular series of minute radially disposed ducts 63 whose respective longitudinal axes are preferably substantially at right angles to the longitudinal axis of the chamber 41.

By manipulation of the respective rods 7 and 30, the shafts 20 and 23 may be made to oscillate to impart independent actuation to their respective cams 22 and 26. The rod 7 controls thethrottle valve 4 and the rod 30 controls the valve 47 The rod 10 operatively connects the bell-crank lever 6 eeaaev working length of the cam'22 is somewhatless than that of the cam 26 and less than would sufice'at any time to effect complete closure of the valve 47 The purpose therein is to. provide effective means for cutting down the gasoline supply relatively to the adjustment of the throttle 4 without killing .the engine. 'Adjustmentof the sleeve 9, fixed by the nuts 12 and 14, aflqrdsi means for regulating and determining the relative effect and degree of the movement of the valve 47 that will be occasioned by move ment of the throttle 4.

By aid of my invention, the liquid fuel supply may be entirely shut off through closure of the valve 47 without being affected by the adjustment of the throttle valve. Consequently, it is made possible by my invention to eliminate any residuum or leakage of hydrocarbon within the shell 1 after the valve 47 is closed and thereby materially to reduce that deposit of carbon within the engine which such residuum or leakage occasions in carburetors hitherto known in the art.

What I claim is:

r In a carburetor, a casing having an air inlet opening, a valve for said opening, means for operating said valve, a fuel delivery nozzle extending through said casing, a valve seat in said casing for controlling the passage of fuel'therethrough, a fuel valve for said seat, a transverse shaft in said casing, a cam on said shaft adapted to engage and to actuate said last mentioned valve, said cam being adapted to effect only a partial closing of the said valve when given a complete movement, means for operating said cam from the air'inlet valve, a second cam on said shaft above" said fuel valve and adapted to completely close the valve, and means for directly and manually actuating said last mentioned cam independently of the first ,mentioned cam and said air inlet valve.

In testimony whereof, I have hereunto set my hand in the presence of two subscribing witnesses.

- v ALBERT D. AUSTIN. Witnesses:

JOSEPH L- A'rxme, LEICESTER B. Amine. 

